The dorsal and ventral interossei are missing, but the ring and Center fingers aren't clawed a result of the presence from the intact 1st and next lumbricals, that are innervated by the median nerve. Tendon sheaths comprise two layers of connective tissue: the internal layer is actually a fragile synovial https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/